A general discussion of the forbidden reactions such as μ→e+γ, μ→e+e+e, μ+N→e+N, μ→e+γ+γ, etc. which would arise from a possible nonlocal structure of the weak interactions is given. It is shown, by a canonical transformation, that the dominating terms of the structure, in an expansion in terms of the inverse of the average intermediate mass, do not contribute to any forbidden reaction. A discussion of the μ-e conversion process for a bound μ is given, and the rate is calculated for a particular model.
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Cabibbo et al. (1959) studied this question.
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